Do not strike or apply heavy pressure directly over "thin-skinned" areas like the shins, elbows, or spine. Focus on fleshy areas like the thighs, buttocks, or pectorals.
Keep the nails in an ice bath or the fridge before a scene. Use the flat head of the nail to deliver "kisses" of intense cold to the inner thighs or neck. iron nail bdsm
The high thermal conductivity of iron means it feels intensely cold against warm skin, creating a sharp sensory contrast. Do not strike or apply heavy pressure directly